syzbot


KMSAN: uninit-value in tipc_nl_compat_link_set (2)

Status: fixed on 2019/03/06 07:43
Subsystems: tipc
[Documentation on labels]
Reported-by: syzbot+d78b8a29241a195aefb8@syzkaller.appspotmail.com
Fix commit: edf5ff04a457 tipc: fix uninit-value in tipc_nl_compat_link_set
First crash: 1932d, last: 1861d
Discussions (8)
Title Replies (including bot) Last reply
[PATCH 4.19 00/99] 4.19.17-stable review 109 (109) 2019/04/22 19:40
[PATCH 4.4 000/104] 4.4.172-stable review 111 (111) 2019/01/30 07:30
[PATCH 4.14 00/59] 4.14.95-stable review 65 (65) 2019/01/23 12:55
[PATCH 4.9 00/51] 4.9.152-stable review 56 (56) 2019/01/23 09:06
[PATCH 4.20 000/111] 4.20.4-stable review 120 (120) 2019/01/23 06:43
[net 0/6] tipc: fix uninit-value issues reported by syzbot 8 (8) 2019/01/16 04:29
[PATCH net] tipc: fix uninit-value in tipc_nl_compat_link_set 4 (4) 2019/01/08 01:33
KMSAN: uninit-value in tipc_nl_compat_link_set (2) 0 (2) 2019/01/07 07:54
Similar bugs (2)
Kernel Title Repro Cause bisect Fix bisect Count Last Reported Patched Status
upstream KMSAN: uninit-value in tipc_nl_compat_link_set (3) tipc C 15 1793d 1803d 12/26 fixed on 2019/04/12 08:05
upstream KMSAN: uninit-value in tipc_nl_compat_link_set tipc syz 5 1948d 1957d 0/26 closed as invalid on 2018/11/16 15:38

Sample crash report:
==================================================================
BUG: KMSAN: uninit-value in strlen+0x3b/0xa0 lib/string.c:486
CPU: 1 PID: 9306 Comm: syz-executor172 Not tainted 4.20.0-rc7+ #2
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
Call Trace:
 __dump_stack lib/dump_stack.c:77 [inline]
 dump_stack+0x173/0x1d0 lib/dump_stack.c:113
 kmsan_report+0x12e/0x2a0 mm/kmsan/kmsan.c:613
 __msan_warning+0x82/0xf0 mm/kmsan/kmsan_instr.c:313
 strlen+0x3b/0xa0 lib/string.c:486
 nla_put_string include/net/netlink.h:1154 [inline]
 __tipc_nl_compat_link_set net/tipc/netlink_compat.c:708 [inline]
 tipc_nl_compat_link_set+0x929/0x1220 net/tipc/netlink_compat.c:744
 __tipc_nl_compat_doit net/tipc/netlink_compat.c:311 [inline]
 tipc_nl_compat_doit+0x3aa/0xaf0 net/tipc/netlink_compat.c:344
 tipc_nl_compat_handle net/tipc/netlink_compat.c:1107 [inline]
 tipc_nl_compat_recv+0x14d7/0x2760 net/tipc/netlink_compat.c:1210
 genl_family_rcv_msg net/netlink/genetlink.c:601 [inline]
 genl_rcv_msg+0x185f/0x1a60 net/netlink/genetlink.c:626
 netlink_rcv_skb+0x444/0x640 net/netlink/af_netlink.c:2477
 genl_rcv+0x63/0x80 net/netlink/genetlink.c:637
 netlink_unicast_kernel net/netlink/af_netlink.c:1310 [inline]
 netlink_unicast+0xf40/0x1020 net/netlink/af_netlink.c:1336
 netlink_sendmsg+0x127f/0x1300 net/netlink/af_netlink.c:1917
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
RIP: 0033:0x440e29
Code: e8 cc ab 02 00 48 83 c4 18 c3 0f 1f 80 00 00 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 0f 83 bb 0a fc ff c3 66 2e 0f 1f 84 00 00 00 00
RSP: 002b:00007fff7fdb6888 EFLAGS: 00000213 ORIG_RAX: 000000000000002e
RAX: ffffffffffffffda RBX: 0000000000000000 RCX: 0000000000440e29
RDX: 0000000000000000 RSI: 0000000020000140 RDI: 0000000000000003
RBP: 0000000000000000 R08: 00000000004002c8 R09: 00000000004002c8
R10: 0000000001fb6880 R11: 0000000000000213 R12: 0000000000012572
R13: 0000000000401e00 R14: 0000000000000000 R15: 0000000000000000

Uninit was created at:
 kmsan_save_stack_with_flags mm/kmsan/kmsan.c:204 [inline]
 kmsan_internal_poison_shadow+0x92/0x150 mm/kmsan/kmsan.c:158
 kmsan_kmalloc+0xa6/0x130 mm/kmsan/kmsan_hooks.c:176
 kmsan_slab_alloc+0xe/0x10 mm/kmsan/kmsan_hooks.c:185
 slab_post_alloc_hook mm/slab.h:446 [inline]
 slab_alloc_node mm/slub.c:2759 [inline]
 __kmalloc_node_track_caller+0xe18/0x1030 mm/slub.c:4383
 __kmalloc_reserve net/core/skbuff.c:137 [inline]
 __alloc_skb+0x309/0xa20 net/core/skbuff.c:205
 alloc_skb include/linux/skbuff.h:998 [inline]
 netlink_alloc_large_skb net/netlink/af_netlink.c:1182 [inline]
 netlink_sendmsg+0xb82/0x1300 net/netlink/af_netlink.c:1892
 sock_sendmsg_nosec net/socket.c:621 [inline]
 sock_sendmsg net/socket.c:631 [inline]
 ___sys_sendmsg+0xdb9/0x11b0 net/socket.c:2116
 __sys_sendmsg net/socket.c:2154 [inline]
 __do_sys_sendmsg net/socket.c:2163 [inline]
 __se_sys_sendmsg+0x305/0x460 net/socket.c:2161
 __x64_sys_sendmsg+0x4a/0x70 net/socket.c:2161
 do_syscall_64+0xbc/0xf0 arch/x86/entry/common.c:291
 entry_SYSCALL_64_after_hwframe+0x63/0xe7
==================================================================

Crashes (13):
Time Kernel Commit Syzkaller Config Log Report Syz repro C repro VM info Assets (help?) Manager Title
2019/01/07 07:53 https://github.com/google/kmsan.git master 11587f6ee534 ee332608 .config console log report syz C ci-upstream-kmsan-gce
2018/12/24 09:15 https://github.com/google/kmsan.git master 75b3ad224f19 be79df56 .config console log report syz ci-upstream-kmsan-gce
2018/11/19 10:57 https://github.com/google/kmsan.git master cddc52641fd2 adf636a8 .config console log report syz ci-upstream-kmsan-gce
2019/01/28 15:03 https://github.com/google/kmsan.git master d16ba73bc696 629c2a27 .config console log report ci-upstream-kmsan-gce
2019/01/07 00:04 https://github.com/google/kmsan.git master 11587f6ee534 ee332608 .config console log report ci-upstream-kmsan-gce
2018/12/24 08:09 https://github.com/google/kmsan.git master 75b3ad224f19 be79df56 .config console log report ci-upstream-kmsan-gce
2018/12/10 12:45 https://github.com/google/kmsan.git master 3f06bda61398 6565f24d .config console log report ci-upstream-kmsan-gce
2018/11/28 12:50 https://github.com/google/kmsan.git master fffec98ae2a6 4b6d14f2 .config console log report ci-upstream-kmsan-gce
2018/11/22 17:51 https://github.com/google/kmsan.git master 3ededcaa1606 2ee77802 .config console log report ci-upstream-kmsan-gce
2018/11/21 16:38 https://github.com/google/kmsan.git master 598a88bc28d3 5d9a3924 .config console log report ci-upstream-kmsan-gce
2018/11/20 14:35 https://github.com/google/kmsan.git master 2808e543aacb 9bc2a903 .config console log report ci-upstream-kmsan-gce
2018/11/18 23:19 https://github.com/google/kmsan.git master cddc52641fd2 adf636a8 .config console log report ci-upstream-kmsan-gce
2018/11/18 19:50 https://github.com/google/kmsan.git master cddc52641fd2 adf636a8 .config console log report ci-upstream-kmsan-gce
* Struck through repros no longer work on HEAD.